What's this thing called the burnout oven anyway. Now I remember, you microwave invested rings before placing in burnout oven so the fumes wouldn't put you to sleep.....
Still have faint flashbacks about using a torch. hot fingers, "asking high school students who poured models to glue fake $50. separating disks back together when they cut off pfm sprues and broke them, " . .
funny and cruel of me.... .... lol
Think Mark might laugh at the labs still using burnout ovens to cast pfms..